Question

5. Pure substances can be obtaine
D. Fill in the blanks with appropriate word(s).
metal on iron surface
1. Galvanisation is a process of coating a layer of
2. Photosynthesis is a
change.
3.
is hydrated iron oxide.
4. Sharpening a pencil is a
change
5.
acid is added during crystallisation of copper sulphate.
hium in ach nf the following:​

Answer 1

Answer:

1.Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting

2.Photosynthesis is the process through which plants convert light energy into chemical energy. Here is the chemical reaction involved: water and carbon dioxide combine to form glucose and oxygen. Since new chemical species are formed, photosynthesis is clearly a chemical change.3.Rust is an iron oxide, a usually reddish brown oxide formed by the reaction of iron and oxygen in the presence of water or air moisture. Rust consists of hydrated iron(III) oxides Fe₂O₃·nH₂O and iron(III) oxide-hydroxide4.When you sharpen your pencil, you have only caused a physical change. The sharpener has cut off some of the wood and maybe also some of the graphite, but the atoms of the wood and graphite have not changed chemically. ... This is only a physical change.5.crystallise copper sulphate, it is dissolved in water and a small quantity of dilute sulphuric acid is added to prevent the hydrolysis of copper sulphte. The impurities left behind in the solution are removed by filtration.